Put Release Notes for version 3.1.0 beta 1

Remove Release Notes for version 3.1.0a2

diff --git a/SALOME3_1_0a2_Release_notes.pdf b/SALOME3_1_0a2_Release_notes.pdf
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diff --git a/SALOME3_1_0beta1_Release_notes.pdf b/SALOME3_1_0beta1_Release_notes.pdf
new file mode 100755 (executable)
index 0000000..f16c02b
Binary files /dev/null and b/SALOME3_1_0beta1_Release_notes.pdf differ